A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism

Abstract

This invention provides a two-dimensional electro-hydraulic servo valve based on a wet-dry separation transmission mechanism, comprising a valve body connected to a motor via a mechanical transmission mechanism; the valve body includes a valve core, a valve sleeve, and a valve body; the mechanical transmission mechanism includes a housing disposed between the valve body and the motor, within which are a wet operating chamber and a dry operating chamber, the wet operating chamber being connected to the internal oil passage of the valve body; the dry operating chamber is located on one side of the wet operating chamber, and the motor rotor extends into the dry operating chamber; the mechanical transmission mechanism also includes a transmission assembly, comprising a first-stage torque amplification mechanism and a second-stage torque amplification mechanism connected together. This invention addresses the problems of high-pressure dynamic seal friction loss and short lifespan in existing two-dimensional electro-hydraulic servo valve structures by incorporating a wet operating chamber; simultaneously, the dry operating chamber ensures that the hydraulic oil does not directly contact the motor; the transmission assembly amplifies the motor's output torque, overcoming various resistances encountered by the valve body during operation.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic servo valve technology, and specifically to a two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism. Background Technology

[0002] Electro-hydraulic servo valves are high-end precision products developed by combining microelectronics and hydraulic technology. Due to their advantages such as fast dynamic response, high control accuracy, and long service life, they are commonly used in aerospace, military, and large-scale high-end equipment fields, such as aircraft braking systems and rolling mill force application systems.

[0003] The two-dimensional electro-hydraulic servo valve was invented and developed by a team from Zhejiang University of Technology after more than 20 years of effort. By improving the structure of traditional servo valves, they achieved superior performance. The two-dimensional electro-hydraulic servo valve utilizes the principle of dual degrees of freedom (direct and rotational) in the valve core for the design of various valve components. In terms of control, the two-dimensional electro-hydraulic servo valve employs an embedded system, using a novel digital control method to achieve control. Under closed-loop control, the two-dimensional electro-hydraulic servo valve uses a high-speed DSP chip feedback system (current and position feedback), significantly improving its linearity, hysteresis, repeatability, and the performance of the open-loop model. The two-dimensional electro-hydraulic servo valve features a simple structure, small size (using a two-dimensional servo screw mechanism), strong anti-contamination capability (integrated main control and pilot control, with the valve core exhibiting both direct and rotational effects), fast response speed, and high control accuracy (a 10-bore servo valve can achieve a flow rate of up to 100L / min and a dynamic frequency response of up to 150Hz).

[0004] Current two-dimensional electro-hydraulic servo valves generally use a motor-driven transmission mechanism. This mechanism transmits the motor's rotation to the valve core, which rotates to change the size of the arc-shaped gap between the high and low pressure orifices and the helical groove, breaking the resistance half-bridge balance. This causes the valve core to move axially under the action of hydraulic unbalanced forces. Current two-dimensional electro-hydraulic servo valve structures use sealing rings to seal between the valve core and the transmission mechanism, ensuring that the hydraulic oil does not come into contact with the motor. However, this sealing ring must withstand both axial friction with the valve core and rotational wear of the valve core. Therefore, existing two-dimensional electro-hydraulic servo valve structures suffer from high-pressure dynamic seal friction loss and short lifespan.

[0005] Furthermore, the valve body needs to overcome multiple resistances during operation, such as the friction between the valve core and the valve sleeve, the tangential hydraulic force between the valve body's oil inlet and the hydraulic oil, and the resistance to oil churning. However, existing transmission mechanisms suffer from insufficient amplification of the motor torque, resulting in a driving force that cannot meet the multiple resistances the valve body needs to overcome during operation. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism. The present invention addresses the problems of high-pressure dynamic seal friction loss and short lifespan in existing two-dimensional electro-hydraulic servo valve structures by setting up a wet operating chamber; simultaneously, it sets up a dry operating chamber to ensure that the hydraulic oil does not directly contact the motor; and it amplifies the motor's output torque through the transmission assembly, overcoming the various resistances encountered by the valve body during operation.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism includes a valve body, which is connected to a motor via a mechanical transmission mechanism. The valve body includes a valve core, a valve sleeve, and a valve body. The valve sleeve is coaxially fitted outside the valve core, and the valve core and the valve sleeve can slide and rotate relative to each other. The valve body is coaxially fitted outside the valve sleeve. Its features are:

[0009] The mechanical transmission mechanism includes a housing disposed between the valve body and the motor. The housing contains a wet operating chamber and a dry operating chamber. The wet operating chamber is connected to the internal oil passage of the valve body. The dry operating chamber is located on one side of the wet operating chamber, and the rotor of the motor extends into the dry operating chamber.

[0010] The mechanical transmission mechanism further includes a transmission assembly, which includes a primary torque amplification mechanism and a secondary torque amplification mechanism connected to each other. The primary torque amplification mechanism is placed in the dry operating chamber and connected to the rotor, while the secondary torque amplification mechanism is placed in the wet operating chamber and connected to the valve core.

[0011] Furthermore: the first-stage torque amplification mechanism includes a motor ball joint and a crankshaft shift fork. The motor ball joint is placed in the shift fork groove of the crankshaft shift fork. The motor ball joint is connected to the rotor through a ball joint connector. The crankshaft shift fork is connected to the second-stage torque amplification mechanism.

[0012] Furthermore: the secondary torque amplification mechanism includes a crankshaft and a valve core intermediate shift fork. The journal of the crankshaft is placed in the shift fork groove of the valve core intermediate shift fork. One end of the crankshaft extends into the dry operating chamber and is connected to the primary torque amplification mechanism. The valve core intermediate shift fork is connected to the valve core.

[0013] Furthermore: the housing includes a wet connecting sleeve, a dry connecting sleeve, and an intermediate connecting sleeve, the intermediate connecting sleeve being placed between the wet connecting sleeve and the dry connecting sleeve, the wet operating chamber being located inside the wet connecting sleeve, and the dry operating chamber being located inside the dry connecting sleeve.

[0014] Furthermore: a rotary reset magnet is provided on the inner wall of the dry connecting sleeve, the rotary reset magnet is sleeved on the rotor, and the rotary reset magnet includes a first reset magnet fixed on the extended end of the rotor and a second reset magnet fixed on the inner wall of the dry connecting sleeve.

[0015] Furthermore: the dry connecting sleeve is configured as a cylinder, the dry connecting sleeve is rotatably connected to the intermediate connecting sleeve, and a zero-adjustment hole is provided on the outer cylinder wall of the side of the dry connecting sleeve.

[0016] Furthermore: the two ends of the secondary torque amplification mechanism are respectively fitted with sealing and positioning structures, the secondary torque amplification mechanism and the sealing and positioning structures are rotatably connected, the wet connecting sleeve is provided with an opening groove, the sealing and positioning structure is embedded in the wet connecting sleeve through the opening groove, and one end of the secondary torque amplification mechanism extends into the dry operating chamber through the opening groove and is connected to the primary torque amplification mechanism.

[0017] Furthermore: the secondary torque amplification mechanism, the valve body, and the sealing and positioning structure on the side away from the primary torque amplification mechanism form a balance chamber, which balances the pressure of the secondary torque amplification mechanism with that of the dry operation chamber.

[0018] Furthermore, the valve core and the secondary torque amplification mechanism are fixedly connected by a valve core transmission rod, which extends into the valve core and is fixedly connected to it.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] This invention addresses the problems of high-pressure dynamic seal friction loss and short lifespan in existing two-dimensional electro-hydraulic servo valve structures by setting a wet operating chamber; at the same time, it sets a dry operating chamber to ensure that the hydraulic oil does not come into direct contact with the motor; and it uses a transmission component to amplify the output torque of the motor in multiple stages to overcome the frictional force of the sealing ring, tangential hydraulic force, and oil stirring resistance experienced by the valve body during operation.

[0021] Both the primary torque amplification mechanism and the secondary torque amplification mechanism of the present invention amplify the output torque of the motor by a factor, and the final torque output to the valve core is the product of the amplification factors of the primary torque amplification mechanism and the secondary torque amplification mechanism. Therefore, the output torque of the motor required for the valve core to rotate can be reduced, thereby allowing the use of a small motor, reducing the overall weight of the two-dimensional electro-hydraulic servo valve, reducing its size, and saving costs.

[0022] The present invention comprises a secondary torque amplification mechanism, a valve body, and a sealing and positioning structure forming a balance chamber. The pressure exerted on the secondary torque amplification mechanism by the balance chamber and the dry operating chamber is balanced, which can prevent the axial lateral force of the primary torque amplification mechanism from acting on the crankshaft, causing it to undergo axial displacement and deformation.

[0023] The present invention provides a rotary reset magnet and a zero adjustment hole on the dry connection sleeve. When the valve core is offset from the zero position after the valve body, mechanical transmission mechanism and motor are assembled, or when the valve core rotates away from the initial zero position during the operation of the valve body, the valve core can be manually zeroed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0025] Figure 2 This is a typical cross-sectional structural diagram of the present invention. Figure 1 ;

[0026] Figure 3 This is a typical cross-sectional structural diagram of the present invention. Figure 2 ;

[0027] Figure 4 This is a schematic diagram of the mechanical transmission mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the wet connecting sleeve of the present invention;

[0029] Figure 6 This is a cross-sectional view of the valve sleeve of the present invention;

[0030] Figure 7 This is a schematic diagram of the valve core structure of the present invention;

[0031] Figure 8 This is an exploded view of the mechanical transmission mechanism of the present invention.

[0032] Reference numerals: 1-Valve body; 2-Mechanical transmission mechanism; 3-Motor; 4-Valve core; 5-Valve sleeve; 6-Valve body; 7-Housing shell; 8-Wet operating chamber; 9-Dry operating chamber; 10-Rotor; 11-Transmission assembly; 12-First-stage torque amplification mechanism; 13-Second-stage torque amplification mechanism; 14-Motor ball joint; 15-Crankshaft shift fork; 16-Shift fork groove of crankshaft shift fork; 17-Ball joint connector; 18-Crankshaft; 19-Valve core intermediate shift fork; 20-Junior journal; 21-Shift fork groove of valve core intermediate shift fork; 22 23-Wet connecting sleeve; 24-Dry connecting sleeve; 25-Intermediate connecting sleeve; 26-Hex socket head cap screw; 27-First reset magnet; 28-Second reset magnet; 29-Zeroing hole; 30-Sealing positioning structure; 31-Opening groove; 32-Balance chamber; 33-Valve core drive rod; 34-Bearing; 35-Sealing ring; 36-High pressure waist-shaped groove; 37-Low pressure waist-shaped groove; 38-Connecting rod; 39-Sensitive chamber; 40-High pressure chamber; 41-Valve core low pressure flow channel; 42-Valve core drive rod flow channel. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0035] like Figures 1 to 8 As shown, a two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism includes a valve body 1, which is connected to a motor 3 via a mechanical transmission mechanism 2. The valve body 1 includes a valve core 4, a valve sleeve 5, and a valve body 6. The valve sleeve 5 is coaxially sleeved outside the valve core 4, and the valve core 4 and the valve sleeve 5 can slide and rotate relative to each other. The valve body 6 is coaxially sleeved outside the valve sleeve 5.

[0036] The mechanical transmission mechanism 2 includes a housing 7 disposed between the valve body 1 and the motor 3. The housing 7 is provided with a wet operating chamber 8 and a dry operating chamber 9. The wet operating chamber 8 is connected to the internal oil circuit of the valve body 1. The dry operating chamber 9 is located on one side of the wet operating chamber 8, and the rotor 10 of the motor 3 extends into the dry operating chamber 9.

[0037] The mechanical transmission mechanism 2 also includes a transmission assembly 11. The transmission mechanism 11 includes a primary torque amplification mechanism 12 and a secondary torque amplification mechanism 13 connected to each other. The primary torque amplification mechanism 12 is placed in the dry operating chamber 9 and connected to the rotor 10. The secondary torque amplification mechanism 13 is placed in the wet operating chamber 8 and connected to the valve core 4.

[0038] The first-stage torque amplification mechanism 12 includes a motor ball joint 14 and a crankshaft shift fork 15. The motor ball joint 14 is placed in the shift fork groove 16 of the crankshaft shift fork. The motor ball joint 14 is connected to the rotor 10 through a ball joint connector 17. The crankshaft shift fork 15 is connected to the second-stage torque amplification mechanism 13.

[0039] The secondary torque amplification mechanism 13 includes a crankshaft 18 and a valve core intermediate shift fork 19. The crankshaft 18 has three sections, namely a journal 20 and connecting rods 37 at both ends of the journal 20. The journal 20 of the crankshaft 18 is placed in the shift fork groove 21 of the valve core intermediate shift fork. One end of the crankshaft 18 extends into the dry operating chamber 9 and is connected to the primary torque amplification mechanism 12. The valve core intermediate shift fork 19 is connected to the valve core 4.

[0040] The opening of the crankshaft shift fork groove 16 is arranged opposite to the opening of the valve core intermediate shift fork groove 21. In this embodiment, the crankshaft shift fork groove 16 is arranged upwards, and the valve core intermediate shift fork groove 21 is arranged downwards. The opening of the crankshaft journal 20 is arranged opposite to the opening of the valve core intermediate shift fork groove 21, that is, the journal 20 is arranged upwards. Therefore, the secondary torque amplification mechanism 13 of the present invention is located entirely in the lower part of the wet operating chamber 8, that is, it is arranged downwards, making it more stable and reliable in the absence of external force and without oil flow or operation.

[0041] Both the primary torque amplification mechanism 12 and the secondary torque amplification mechanism 13 amplify the output torque of the motor 3 by a factor, and the final torque output to the valve core 4 is the product of the amplification factors of the primary torque amplification mechanism 12 and the secondary torque amplification mechanism 13.

[0042] This invention can amplify the output torque of motor 3 by multiple levels, reduce the output torque of motor 3 required for valve core 4 to rotate, thereby allowing the use of a small motor 3, reducing the overall weight of the two-dimensional electro-hydraulic servo valve, reducing its size, and saving costs.

[0043] This invention amplifies the output torque of motor 3 by multiple stages, resulting in a greater driving force for valve core 4 under a certain load, thereby improving the response speed of the two-dimensional electro-hydraulic servo valve.

[0044] The present invention provides a wet operating chamber 8 to solve the problems of high-pressure dynamic seal friction loss and short service life in the existing two-dimensional electro-hydraulic servo valve structure; at the same time, a dry operating chamber 9 is provided to ensure that the hydraulic oil does not directly contact the motor 3; the output torque of the motor 3 is amplified by the transmission component 11 to overcome the frictional force of the sealing ring, tangential hydraulic force and oil stirring resistance experienced by the valve body 6 during operation.

[0045] The housing 7 includes a wet connecting sleeve 22, a dry connecting sleeve 23, and an intermediate connecting sleeve 24. The intermediate connecting sleeve 24 is positioned between the wet connecting sleeve 22 and the dry connecting sleeve 23. The wet operating chamber 8 is located within the wet connecting sleeve 22, and the dry operating chamber 9 is located within the dry connecting sleeve 23. The wet connecting sleeve 22, the dry connecting sleeve 23, and the intermediate connecting sleeve 24 are detachably connected. The motor 3, the wet connecting sleeve 22, and the valve body 6 are fixedly connected by hexagon socket screws 25. The dry connecting sleeve 23 and the intermediate connecting sleeve 24 are clamped and fixed between the motor 3 and the wet connecting sleeve 22.

[0046] A rotary reset magnet is provided on the inner wall of the dry connecting sleeve 23. The rotary reset magnet is sleeved on the rotor 10. The rotary reset magnet includes a first reset magnet 26 fixed to the protruding end of the rotor 10 and a second reset magnet 27 fixed to the inner wall of the dry connecting sleeve 23. In this embodiment, the first reset magnet 26 and the second reset magnet 27 are closely spaced and have opposite polarities, thus attracting each other.

[0047] The dry connecting sleeve 23 is cylindrical and can be rotatably connected to the intermediate connecting sleeve 24. A zero-adjustment hole 28 is provided on the outer cylindrical wall of the side of the dry connecting sleeve 23. The operator only needs to remove the fixed internal hexagon screw 25 to operate the dry connecting sleeve 23 to rotate.

[0048] When the valve core 4 deviates from its zero position after the valve body 1, mechanical transmission mechanism 2, and motor 3 are assembled, or when the valve core 4 deviates from its initial zero position during operation, manual zeroing is required. Specifically, the operator uses a zeroing tool in conjunction with the zeroing hole 28 to control the rotation of the dry connecting sleeve 23 relative to the intermediate connecting sleeve 24 and motor 3. The rotation of the dry connecting sleeve 23 causes the second reset magnet 27 to rotate. Because the first reset magnet 26 and the second reset magnet 27 attract each other, the second reset magnet 27 rotates, simultaneously causing the rotor 10 of the motor 3 to rotate. The mechanical transmission mechanism 2 transmits the torque output by the rotor 10 to the valve core 4, ultimately ensuring that the valve core 4 returns to its initial zero position, thus achieving manual zeroing.

[0049] The two ends of the secondary torque amplification mechanism 13 are respectively fitted with sealing positioning structures 29, and the secondary torque amplification mechanism 13 and the sealing positioning structure 29 are rotatably connected. The wet connecting sleeve 22 has an opening groove 30 through it, and the sealing positioning structure 29 is embedded in the wet connecting sleeve 22 through the opening groove 30. One end of the secondary torque amplification mechanism 13 extends into the dry operating chamber 9 through the opening groove 30 and is connected to the primary torque amplification mechanism 12.

[0050] The secondary torque amplification mechanism 13, the valve body 6, and the sealing and positioning structure 29 on the side away from the primary torque amplification mechanism 12 form a balance chamber 31. The balance chamber 31 balances the pressure of the secondary torque amplification mechanism 13 on the dry operating chamber 9, which can prevent the axial lateral force of the primary torque amplification mechanism 12 from acting on the crankshaft 18, causing it to undergo axial displacement and deformation.

[0051] The sealing and positioning structure 29 includes a sealing ring 34 and a bearing 33, which are mounted side-by-side on the connecting rod 37. The bearing 33 on the sealing and positioning structure 29 is positioned relative to the sealing ring 34 near the valve core's central fork 19. The sealing ring 34 only bears the rotational wear caused by the crankshaft 18's oscillation. The bearing 33 supports the crankshaft 18, reducing its coefficient of friction during operation and ensuring its rotational accuracy, thus playing a role in fixing and reducing the coefficient of friction under load during mechanical transmission. The sealing ring 34 prevents hydraulic oil leakage from the wet operating chamber 8 while forming a balance chamber 31 with the valve body 6 and connecting rod 37 that is pressure-balanced with the dry operating chamber 9, demonstrating an ingenious structure.

[0052] The valve core 4 and the secondary torque amplification mechanism 13 are fixedly connected by a valve core transmission rod 32, which extends into the valve core 4 and is fixedly connected to it. The valve core 4 has a low-pressure flow channel 41 inside, and the valve core transmission rod 32 has a through-flow channel 42. The low-pressure flow channel 41 is connected to the wet operating chamber 8 through the valve core transmission rod channel 42.

[0053] In this embodiment, valve sleeve 5 as Figure 6 As shown, the valve sleeve 5 has ports P, A, T, B, and P sequentially opened upwards, where port P is the oil inlet and port T is the oil outlet. A sensitive cavity channel 38 is provided on the valve sleeve 5. The valve core 4 has a high-pressure waist-shaped groove 35 and a low-pressure waist-shaped groove 36. The sensitive cavity channel 38 forms variable throttling orifices with the high-pressure waist-shaped groove 35 and the low-pressure waist-shaped groove 36 respectively. The high-pressure waist-shaped groove 35 and the low-pressure waist-shaped groove 36 communicate with the sensitive cavity 39 inside the valve body 1 through the sensitive cavity channel 38. The two variable throttling orifices are connected in series to form a resistance half-bridge, thereby controlling the pressure in the sensitive cavity 39.

[0054] like Figure 3 As shown, when there is no control signal from motor 3, valve core 4 is in the zero position. The intersection area of ​​high pressure waist-shaped groove 35 and low pressure waist-shaped groove 36 with sensitive cavity channel 38 is the same. The pressure at the left end of valve core 4 is half of the system pressure P, while the pressure at the right end is always P. At this time, the effective area of ​​high pressure cavity 40 in valve body 1 is only half of the area of ​​sensitive cavity 39. Therefore, the pressure of high pressure cavity 40 and sensitive cavity 39 are equal, and valve core 4 is in a balanced state.

[0055] pass Figure 2-4 It can be seen that:

[0056] 1. When the motor 3 receives a control signal, its rotor 10 rotates clockwise (viewed from right to left), causing the motor ball joint 14 to swing to the right (viewed from right to left). Under the pressure of the motor ball joint 14, the crankshaft fork 15 rotates clockwise by a corresponding angle, achieving first-stage torque amplification. The rotation of the crankshaft fork 15 causes the crankshaft 18 to swing to the left (viewed from right to left). Under the pressure of the crankshaft 18, the valve core middle fork 19 rotates clockwise (viewed from right to left) by a corresponding angle, achieving second-stage torque amplification. The clockwise rotation of the valve core middle fork 19 ultimately drives the valve core 4 to rotate clockwise (viewed from right to left) through the valve core transmission rod 32. After the valve core 4 rotates, the interface area between the high-pressure waist-shaped groove 35 and the low-pressure waist-shaped groove 36 and the sensitive cavity channel 38 changes, causing a change in the pressure within the sensitive cavity 39, and the valve core 4 moves axially.

[0057] When the valve core 4 rotates clockwise (viewed from right to left) with the valve core fork 7, the interface area between the high-pressure waist-shaped groove 35 and the sensitive cavity channel 38 on the valve core 4 decreases, while the interface area between the low-pressure waist-shaped groove 36 and the sensitive cavity channel 38 increases. The pressure in the sensitive cavity 39 on the left side of the valve core 4 decreases, while the pressure in the high-pressure cavity 40 on the right side of the valve core 4 remains constant. Therefore, the valve core 4 moves axially to the left under the action of the unbalanced fluid pressure in the left and right cavities.

[0058] 2. Similarly, when the motor 3 receives a control signal, the rotor 10 of the motor 3 rotates counterclockwise (viewed from right to left), causing the motor ball head 14 to swing to the left (viewed from right to left). Under the pressure of the motor ball head 14, the crankshaft fork 15 rotates counterclockwise by the corresponding angle, achieving first-stage torque amplification. The rotation of the crankshaft fork 15 causes the crankshaft 18 to swing to the right (viewed from right to left). Under the pressure of the crankshaft 18, the valve core middle fork 19 rotates counterclockwise (viewed from right to left) by the corresponding angle, achieving second-stage torque amplification. The counterclockwise rotation of the valve core middle fork 19 ultimately drives the valve core 4 to rotate counterclockwise (viewed from right to left) through the valve core transmission rod 32. After the valve core 4 rotates, the interface area between the high-pressure waist-shaped groove 35 and the low-pressure waist-shaped groove 36 and the sensitive cavity channel 38 changes, causing the pressure in the sensitive cavity 39 to change, and the valve core 4 moves axially.

[0059] When the valve core 4 rotates counterclockwise (viewed from right to left) with the valve core fork 7, the interface area between the high-pressure waist-shaped groove 35 and the sensitive cavity channel 38 on the step of the valve core 4 increases, while the interface area between the low-pressure waist-shaped groove 36 and the sensitive cavity channel 38 decreases. The pressure in the sensitive cavity 39 on the left side of the valve core 4 increases, while the pressure in the high-pressure cavity 40 on the right side of the valve core 4 remains constant. Therefore, the valve core 4 moves axially to the right under the action of the unbalanced fluid pressure in the left and right cavities.

[0060] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the two-dimensional electro-hydraulic servo valve based on the dry-wet separation transmission mechanism of this invention, and can achieve the positive effects described in this invention.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism, comprising a valve body, the valve body being connected to a motor via a mechanical transmission mechanism; the valve body comprising a valve core, a valve sleeve, and a valve body, the valve sleeve being coaxially sleeved outside the valve core, the valve core and the valve sleeve being able to slide and rotate relative to each other, and the valve body being coaxially sleeved outside the valve sleeve; characterized in that: The mechanical transmission mechanism includes a housing disposed between the valve body and the motor. The housing contains a wet operating chamber and a dry operating chamber. The wet operating chamber is connected to the internal oil passage of the valve body. The dry operating chamber is located on one side of the wet operating chamber, and the rotor of the motor extends into the dry operating chamber. The mechanical transmission mechanism further includes a transmission assembly, which includes a primary torque amplification mechanism and a secondary torque amplification mechanism connected to each other. The primary torque amplification mechanism is placed in the dry operating chamber and connected to the rotor, while the secondary torque amplification mechanism is placed in the wet operating chamber and connected to the valve core. The housing includes a wet connecting sleeve, a dry connecting sleeve, and an intermediate connecting sleeve. The intermediate connecting sleeve is located between the wet connecting sleeve and the dry connecting sleeve. The wet operating chamber is located inside the wet connecting sleeve, and the dry operating chamber is located inside the dry connecting sleeve. A rotary reset magnet is provided on the inner wall of the dry connecting sleeve. The rotary reset magnet is sleeved on the rotor. The rotary reset magnet includes a first reset magnet fixed on the extended end of the rotor and a second reset magnet fixed on the inner wall of the dry connecting sleeve. The dry connecting sleeve is cylindrical, and the dry connecting sleeve is rotatably connected to the intermediate connecting sleeve. A zero-adjustment hole is provided on the outer cylindrical wall of the side of the dry connecting sleeve.

2. A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, characterized in that: The primary torque amplification mechanism includes a motor ball joint and a crankshaft shift fork. The motor ball joint is placed in the shift fork groove of the crankshaft shift fork and is connected to the rotor through a ball joint connector. The crankshaft shift fork is connected to the secondary torque amplification mechanism.

3. A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, characterized in that: The secondary torque amplification mechanism includes a crankshaft and a valve core intermediate shift fork. The journal of the crankshaft is placed in the shift fork groove of the valve core intermediate shift fork. One end of the crankshaft extends into the dry operating chamber and is connected to the primary torque amplification mechanism. The valve core intermediate shift fork is connected to the valve core.

4. A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, characterized in that: The two ends of the secondary torque amplification mechanism are fitted with sealing and positioning structures, and the secondary torque amplification mechanism and the sealing and positioning structures are rotatably connected. The wet connecting sleeve has an opening groove through it, and the sealing and positioning structure is embedded in the wet connecting sleeve through the opening groove. One end of the secondary torque amplification mechanism extends into the dry operating chamber through the opening groove and connects with the primary torque amplification mechanism.

5. A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 4, characterized in that: The secondary torque amplification mechanism, valve body, and sealing and positioning structure on the side away from the primary torque amplification mechanism form a balance chamber, which balances the pressure of the secondary torque amplification mechanism with that of the dry operation chamber.

6. A two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, characterized in that: The valve core and the secondary torque amplification mechanism are fixedly connected by a valve core transmission rod, which extends into the valve core and is fixedly connected to it.

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